It says "legacy" code.
Legacy code is typically a euphemism for old unmaintained code, no one knows how it works so it can be edited, and it probably doesn't align with current work practices.
Not to say a rewrite is necessary right, but avoiding rewrites of working code is how we ended up with more COBOL code than COBOL programmers in 2026.
I don't think no one knows how it works. I just think the people using the word "legacy" for it are boneheaded.
If nobody knows how the old code works, how will anyone know how the new code (written by an autonomous agent) works?